package com.wwl.cms.utils.designModeTest.observer.improve;

/**
 * @author wwl
 * @version 1.0
 * @date 2021/9/13 19:44
 * @description:
 */
public interface Subject {
    public void registerObserver(Observer o);
    public void removeObserver(Observer o);
    public void notifyObserver();
}
